Batsman Shaun Marsh will continue his Test tune-up on Monday by anchoring Western Australia's final-day run chase against South Australia in the Sheffield Shield. Chasing 313 to win, the Warriors will resume at 4-146 on the final day at Adelaide Oval with Marsh not out 72. Marsh and younger brother Mitch put on an 83-run partnership to give WA hope of victory. Mitch fell for 44 but Shaun looked in fine touch, hitting nine fours and two sixes in his 102-ball knock. "He is batting beautifully," SA wicketkeeper Harry Nielsen said of Marsh. "We need to get him early and we back ourselves to go right through them. "He is a key to their chase but the ball is reversing - it's going to be tough work." SA swing bowler Daniel Worrall has 3-58, after his seven-wicket haul in the first innings. Australian Associated Press